Attachment-holder for sewing-machines.



No. 705,354. Patented July 22, I902.

F. JACOB, 1n. ATTACHMENT HOLDER FOR SEWING MACHINES.

(Application filed Apr. 18, 1902.)

(No Model.)

ATTORNEY i WTNESSES A YHE 'Ncnms PETERS co. Puma-Una. wAsnmcrom n. c.

V UNITED STAT S PATENT OFFICE.

FREDERICK JACOB, JR., OF NEWARK, NEWV JERSEY.

ATTACHMENT-HOLDER FOR SEWING-MACHINES.

SPECIFICATION forming part of Letterslatent No. 705,354, dated July 22, 1902.

Application filed April 18, 1902.

' To. all whom it may concern.-

Be itknown that I, FREDERICK JACOB, J r., a citizen of the United States of America, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Clamping Devices, of which the following is a specification.

My invention has reference to improve ments in clamping devices, and particularly to devices adapted for holding attachments rigidly and firmly to the presser-bars of seW-' ing-machines, my said invention having for. its objects the provision of. a socket readily attachable to the presser-bar of a sewing-machine or other bar and to provide the sev-' eral attachments with shanks adapted to be received by the socket all in the same manner or direction and to be subsequently retained within the socket by simply turning the fastening screw.

With these objects in View my invention consists, essentially, in a socket provided with a diametrical slot, a screw arranged transversely to the slot and provided with a tapered inner end adapted to cross said slot, and anattachment piece formed to enter said slot in the socket and provided with a tapered recess adapted to be engaged by the screw, all for the purpose of drawing the attachment upwardly within the slot.

My invention also consists in further novel features of construction, all of which will best be understood when described in connection with the accompanying drawings, in which- Figure 1 represents a side view of a presser-' bar provided with my improved socket and a presser-foot secured within said socket. Fig. 2 is a vertical section thereof. Fig. 3 is a horizontal section on the line 3 3, Fig. 1. Fig. 4 is a rear view of the presser-foot. Fig. 5 is a perspective view of a modified form for the attachment end of the presser-foot. Fig. 6 is a horizontal section on the line 6 6, Fig. 5. Fig. 7 is a verticalsection showing the socket and attached presser-foot. Fig. 8 is a rear View of another modified form for the attachment end of the. presser-foot. Fig. 9 is a horizontal section on the line 9 9, Fig. 8. Fig. 10 is a side elevation showing the socket and attached presser foot. 1

Serial No. 103,506. (No model.)

Similar letters and numerals of reference designate corresponding parts throughout the several views of the drawings.

Referring now to the drawings, the letter A designates the presser-bar of a-sewing-machine. B is the socket attached thereto, and O is the presser-foot. The socket B is bored out longitudinally for the reception of the presser-bar A, to which said socket is secured by means of a set-screw 2. Into the socket Bis also cut a diametrical slot 3, extending in the direction of the length of said socket upwardly from its lower end. The socket is transversely drilled and threaded for the reception of a screw 4., havinga tapered end 5, and is also preferably provided in line with said screw with an opening 6, although this opening is not absolutely essential.

The attachment end 7 of the presser-foot G is in the present instance in the form of 'a rectangular shank adapted to enter the diametrical slot 3 of the socket B from one side and is providedwith a transverse tapered depresfrom the top of the diametrical slot 3. Consequently when the shank is inserted and the screw 4 drawn up the tapered end 5 of the said screw draws the shank firmly up against the shoulder at the inner end of the slot and at the same time forces the shank firmly against the lateral wall of the socket, thus rigidly holding the attachment to the socket, and consequently to the presser-foot. If desired, both the slot 3 and the attachment end for shank 7 of the presser-foot may be slightly tapered from above downwardly and outwardly, so as to wedge the shank within the socket; but this not absolutely essentialfto insure firm retention of the attachment.

In the modification shown in Figs. 5 to 7 the presser foot O has its flat shank 7 pro vided with a contact surface D, formed by striking up a portion of said shank substantially semicircular in cross-section. Above this contact-surface the tapered depression or opening 8, adapted to be engaged by the screw 4, is formed. The contact-surface D fits the bore 1 of the socket B, and the tightening efiect is the same as in the example previously described when the screw 4 is screwed up. The contactsurface D is located some distance below the top of the shank 7, so as to enable the attachment to be inserted from the side of the socket. The contact-surface may also be slightly tapered outwardly and downwardly toward the sides of the shank.

In Figs. 8, 9, and 10 I have shown a modification in which the contact-surface on the shank 7 of the attachment 0 is in the form of two flanges D, adapted to engage with the periphery of the socket when the presser-foot is drawn up by the screw 4. These flanges are preferably tapered downwardly and inwardly, so as to bind on the outside of the socket, and terminate at some distance from the top of the shank, so as to permit lateral insertion into the socket, as before.

It will be readily seen that by providing the several attachments commonly supplied with sewing-machines-such as tuckers,he1nmers, &c.-with shanks of the nature described and of standard form all such attachments can be inserted with the greatest ease in a uniform manner after the removal of the presser-foot.

Of course it is to be understood that I do not wish to restrict myself to the application of my invention to sewing-machines and attachments therefor, as it is evident that it can be applied to many other purposes with the same efiect.

What I claim as new is- 1. A clamping device comprising a socket provided with a diametrical slot, a screw arranged transversely to the slot and provided with a tapered inner end adapted to cross said slot, and an attachment-piece formed to enter said slot in the socket and provided with a tapered recess adapted to be engaged by the tapered end of the screw; all for the purpose of drawing the attachment-piece upwardly within the slot and forcing the same against the wall of the socket laterally, substantially as described.

2. A clamping device comprising a socket provided with a diametrical slot and with a longitudinal bore, a screw arranged at right angles to the slot and provided with a tapered inner end adapted to cross said slot, and an attachment-piece provided with a tapered recess adapted to be engaged by the tapered end of the screw and with a curved contact- .surface adapted to engage with the wall of the socket; all for the purpose of drawing the attachment-piece upwardly within the slot and forcing the same against the wall of the socket laterally, substantially as described.

3. A clamping device comprising a socket provided with a diametrical slot and with a longitudinal bore, a screw arranged at right angles to the slot and provided with a tapered inner end adapted to cross said slot, and an attachment-piece provided with a tapered recess adapted to be engaged by the tapered end of the screw and with a curved contactsurface diverging from its top and adapted to engage with the wall of the socket; all for the purpose of drawing the attachment-piece upwardly within the slot and forcing the same against the wall of the socket laterally, substantially as described.

4. A clamping device comprising a socket provided with a diametrical slot and with a longitudinal bore, a screw arranged at right angles to the slot and provided with a tapered inner end adapted to cross said slot, and an attachment-piece provided with a tapered recess adapted to be engaged by the tapered end of the screw and with one or more inclined contact-surfaces adapted to engage with the Wall of the socket, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

FREDERICK JACOB, JR. Witnesses:

A. FABER DU FAUR, J r., J. BoPPEL. 

